Longicorn beetles (Coleoptera: Disteniidae, Cerambycidae) of the Russky Island (Primorsky Krai, Russia)

In this paper the first report on species composition, the seasonal dynamics of imago activity, as well as trophic and zoogeographic features of the longicorn beetle fauna of Russky Island is given.

captured in flight using a butterfly net, or captured using a light system. All the material studied is stored in the authors' personal collections.
In the annotated list and in Fig. 1, the collection points are denoted with the following numbers:  In order to reduce the amount of text in the annotated listing, only the name of the collector S. Samokhin is indicated; all other material was collected by V. Bezborodov.

Asemini Thomson, 1860
A total of 61 species belonging to 44 genera, 21 tribes, five subfamilies, and two families of longicorn beetles have been identified on Russky Island. Disteniidae are represented by one of the two species found in Russia: Distenia gracilis. The remaining species belong to the family Cerambycidae with the subfamilies of Lepturinae (24 species), Cerambycinae (18 species), Lamiinae (16 species), Necydalinae and Spondylidinae (one species for each subfamily).
The chorological analysis of the longicorn beetles fauna of Russky Island shows that the species belonging to the East Asian faunistic complex are predominating: 33 species (54.1%). The remaining species belong to the boreal complex and are widely distributed throughout the Palearctic region (18 species; 29.5%) or the Eastern part of Eurasia (seven species; 11.4%); three species occur in the Holarctic region (4.9%).
Forty species (65.6%) are trophically linked only to deciduous trees and shrub vegetation. The group of polyphagous species inhabiting deciduous and coniferous trees is much smaller (14 species; 22.9%); five species (8.2%) inhabit only coniferous trees. The trophic group linked to herbaceous plants is represented by only two species (3.3%).
An analysis of imago phenology makes it possible to single out four phenological groups. The early-summer group. Imago activity begins in May or early June and ends in July: 14 species (22.9% of the total fauna).
The summer group. Imago are active thoughout all three summer months: 38 species (62.3%).
The late-summer group. Imago activity begins in July and ends in August or September: three species (4.9%).
The spring-summer-autumn group. Imago activity begins in May and ends in September: six species (9.8%).
The following dynamics of activity of longicorn beetle imago are observed on Russky Island: for 44.2% species, adults are active in May; the number of species increases (95%) in June, peaks in July (98.3%), decreases in August (60.6%), and the smallest number of species is active in September (16.4%).
Thus, the family Cerambycidae dominates the longicorn beetles fauna of Russky Island. The largest number of species belongs to the subfamily Lepturinae. Most species of the longicorn beetles inhabiting Russky Island are of East Asian origin. The vast majority (88.5%) of the species found on the Island are trophically linked to deciduous trees or are wide polyphages. The peak of imago activity of most species occurs at the end of June and in July. The insects were collected during all summer months. It can be assumed that most of the Russky Island's longicorn beetles fauna has been identified. These species make up 23% of the total number of the longicorn beetle species of Primorsky Krai (Danilevsky, 2014(Danilevsky, , 2020aCherepanov, 1979Cherepanov, , 1981Cherepanov, , 1982Cherepanov, , 1983Cherepanov, , 1984Cherepanov, , 1985Cherepanov, , 1996. The relatively small number of longicorn beetles species inhabiting Russky Island compared to the mainland can be attributed to its isolation and small area, as well as the relatively low landscape diversity.